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Crude unit overhead corrosion monitoring & mitigation

Query Raised By: Sudhir A, Manager, HPCL

Sir, wish to know industry best practices on corrosion monitoring and mitigating measures in Crude unit overhead circuits. Following info is being sought: 1) Corrosion monitoring parameters with limits 2) Allowable & actual corrosion rate in overhead circuits 3) mitigating measures being adopted

Query Raised On: 2019-07-25 09:48

(1) Comments

Subramoni Iyer M.R., CGM (Tech.), BPCL-Kochi(Expert) - 27-Jul,2019 12:03

• Corrosion rate limit is 5 mpy or 0.125 mm/year. • Normal limits for overhead Boot water: Iron <1 ppm; chlorides <25 ppm (Max: 30 ppm) • Detailed corrosion mechanism & control methodologies are available in NACE document (Crude Distillation Unit—Distillation Tower Overhead System Corrosion, December 2009, NACE International)